Metal-working tool

ABSTRACT

Discloses a hand tool, comprising a combination punch and pop riveter. A drawbar actuated by means of a handle in the form of a lever moves the punch from retracted to extended position and in the same motion actuates the pop rivet assembly so as to pull the shaft of the pop rivet assembly through the collar forming the fastener so as to flare the collar and form a bottom flange. The combination of the two attachments operated off the same mechanism eliminates the necessity of carrying a separate punch or drill on the job for use with the pop riveter.

Sta. 1 s Wtet 537,382 4/1895 Branson Primary Examiner-John F. CampbellAssistant Examiner-Donald P. Rooney Attorney-William R. Price ABSTRACT:Discloses a hand tool, comprising a combination punch and pop riveter. Adrawbar actuated by means of a handle in the form of a lever moves thepunch from retracted to extended position and in the same motionactuates the pop rivet assembly so as to pull the shaft of the pop rivetassembly through the collar forming the fastener so as to flare thecollar and form a bottom flange, The combination of the two attachmentsoperated oi? the same mechanism eliminates the necessity of carrying aseparate punch or drill on the job for use with the pop riveter.

1 t l 7 l 1 PATENTEDAUGBI mm 3,601, 880

e6 II/Il/Il/IIIII INVENTOR ELMORE BROWN,JR.

ATTORNEY METAL-WORKING TOOL FIELD OF THE INVENTION This inventionrelates generally to hand tools and more specifically, to tools forpunching holes in sheet metal, and for DESCRIPTION OF THE PRIOR ART Poprivets have found considerable acceptance in the sheet metal industry.Pop rivets consist of a metal collar, having an upper flange andcontaining a shaft with an enlarged head extending through the collar.If the shaft is pulled through the collar, the enlarged head flares thebottom portion of the collar to form a lower flange. Thus, it isnecessary in the use of the pop rivets to first form a hole that themetallic fastening collar can be inserted into, prior to flaring thebottom portion of same to form a fastening lower flange. Since muchsheet metal work is done in construction sites where power is not yetavailable, in many instances, a power drill is not feasible so thathand-operated punches must be utilized This necessitates, then, that theworkmen carry both a hand-operated punch and a pop riveter or haveavailable power and a power drill for drilling the holes through thesheet metal pieces to be joined together by pop rivets. Previously,Granberg in US. Pat. No. 3,156,087 and 3,182,442 has proposed tools forremoving rivets from a chainsaw and a separate attachment forapplication of a new rivet in the chainsaw. Essentially, this toolconsisted of a plier-type hand tool containing a punching head which fitover a recess between two anvils so that the punch could force the rivetthrough the chainsaw pieces into the recess. A separate spinningattachment was contained in the tool and a socket for a rivethead sothat a new rivet could be spun around into position as the saw was putback together. A similar type arrangement was proposed by Urbaitis for achainsaw in U.S. Pat. No. 3,233,402 and another type of tool for thesame general purpose was disclosed in U.S. Pat. No. 3,234,643 by Johnsonet al., for repair of mower blades et cetera. Insofar as I am aware,however, there has not been proposed a mechanism for punching a hole insheet metal in combination with an attachment for inserting a pop rivetthrough the holes punched to join pieces of sheet metal together.Further, insofar as I am aware, there has not been proposed a toolwherein the action of extending the punch simultaneously actuated thepop rivet assembly.

SUMMARY OF THE INVENTION According to my invention, there is provided ahand metal working tool, containing a punch and die assembly and a poprivet assembly with a common drawbar action and means for actuating saiddrawbar to move the punch from a retracted to extended position and tosimultaneously actuate the pop rivet assembly. Further, there isprovided a tool whereby the workmen may punch holes in sheet metal of aspecific size and thereafter join the sheet metal pieces together bymeans of a pop rivet. Further, there is provided a punch and dieassembly which may be interchanged with punch and die assemblies ofdifferent sizes for use with various size pop rivets. Other advantageswill occur to those skilled in the art from the detailed description ofthe invention hereinafter provided. BRIEF DESCRIPTION OF Til-IE DRAWINGSFIG. I is a side elevation illustrating the overall configuration of thetool of this invention.

FIG. 2 is a view in perspective, illustrating the use of the tool topunch holes in two pieces of sheet metal.

FIG. 3 is another view in perspective, illustrating the use of the toolin joining the pieces of sheet metal together with a pop rivet.

FIG. 1 is a sectional view, partially in elevation, illustrating themechanism of both the pop rivet assembly and the punch and dieattachment and the drawbar, actuating both of these attachments.

FIG. 5 is a front elevational view, illustrating generally the tool andthe relationship of the pop rivet assembly and the punch assembly to thefirst housing. DETAILED DESCRIP- TION OF THE DRAWINGS Referring now tothe drawings in detail, the tool consists of a bottom essentiallyimmovable handle 1, which in the front portion forms a main or firsthousing 2 for the various parts of the actuating mechanism. The upperhandle 3 consists of an effort arm EA, and a resistance arm RA, forminga lever with its fulcrum at 4, which consists of a pin driven throughthe main housing 2 and the upper handle 3 and the depending ears 6 ofpunch attachment 7, so as to hold the inclined surface 5 of the punchattachment in registry with the upper surface of the main housing 2. Theupper portion of the punch attachment 7 contains a throat 3 forinsertion of the sheet metal pieces 17 and 18 and the attachmentcontains a bifurcation 9 in the rear portion for provision of the effortarm EA of upper handle 3. The pop rivet attachment 10 is threadablyattached to a threaded boss 11 on the lower surface of the first housing2.

As previously mentioned, the pop rivet 12 consists of a fastener collar15 containing an upper flange 116 through which is inserted a shaft 13containing an enlarged head 14. If the fastener collar 15 is insertedthrough two holes in registry in two pieces of sheet metal so that theupper flange 16 is in abutment with the upper surface surrounding theupper hole of sheet metal piece 17 and the shaft 13 is drawn upwardlythrough the fastener collar 15, the enlarged head 14 of the shaft 13will flare the lower portion of the fastener collar 15 to form a lowerfastening flange on the bottom surface of the sheet metal piece 13. Ifsufficient stress is exerted on the shaft 13, the shaft will break andthe upper and lower flanges of the fastener collar will hold the sheetmetal pieces 17 and 18 together.

As previously indicated, the fulcrum for the upper handle is a pin 4,which is journaled in bushing 20 in upper handle 3 and which extendsthrough depending ears 6 of the punch attachment 7 and is held inposition by means of snap ring 19. The upper handle 3 is held in openposition as shown in FIG. 4 by means of spring 22, mounted in detentopenings 21 on upper and lower handles I and 3.

Referring now to the pop rivet attachment 10; this consists of animmovable outer shell, threadably attached to threaded boss 11, locatedon the lower surface of the first housing 2. At the bottom of the outershell 32 is a threaded fitting 30 containing a central bore 31 forprovision of shaft 13 of the pop rivet 12. The fitting 31) fits againstthe upper flange 16 of the fastener collar 15 of the pop rivet 12. Innershell 33 is internally threaded at point 34 for threaded attachment tothe external threads 36 of drawbar 35 which extends through the bore ofthreaded boss 11. The lower portion of drawbar 35 contains a centralbore 37, running from the bottom of the drawbar to a point adjacent hole66 in which the pin 65 is fitted. Contained in the central bore 37 is aspring 33 which is biased against the upper end of plunger 40, which, inturn, contains a central bore 41 in registry with the central bore 37 ofthe drawbar 35. Plunger 410 contains a conical head 42, which fits intoa conical depression formed in the top of the pair of jaws which fit inthe tapered recess 44 of inner shell 33 and project therefrom. Thus, itwill be seen that shaft 13 of pop rivet 12 extends through the centralbore 31 of fitting 30 through the jaws 413 and into the central bore 4-1of plunger 40 and into the central bore 37 of the drawbar 35 to besurrounded by spring 31 The drawbar is attached to the resistance arm RAof the lever formed by upper handle 3 by means of pin 65, fitted throughthe hole 66 in the middle of the drawbar 35 so that when the effort armEA is closed, as shown in FIG. 2 and 3, the resistance arm RA of theupper handle 3, moves drawbar attachment upwardly so that the plunger 40is biased against the spring 38 and causes jaws 43 to increase theirgrip on the shaft 13 of pop rivet 12 and thus draw the lar 15. Since theupper flange 16 is in engagement with the fitting 31, this flares thefastening collar and forms a lower flange to join two pieces of sheetmetal together. Sufficient stress is placed on shaft 13 that the shaftbreaks. As pressure is released on the effort arm EA of handle 3, spring22 pulls the handle 3 into open position as illustrated in FIG. 1, thusreversing the rectilinear movement of drawbar 35 downwardly so as torelieve the pressure of spring 38 against plunger 40, thus allowing thejaws 43 to open and release the broken part of shaft 13.

At the upper end of the drawbar 35 is located arecess 50 for provisionof head 51 of the punch 53, which, as illustrated in FIG. 2, has itsbody 52, slidably positioned in the bore 54 of the punch attachment 7.In alignment with bore 54, is a recess 60 in which die button 61containing die 62 is fitted and secured into position by means ofthreaded cap 70 having a slot 71 for provision of the blade of ascrewdriver.

It will be appreciated that the punch 53 can be provided in severalsizes, since the only criterion is the size of the head 51 so it fits inthe recess of drawbar 35 and the diameter of the body 52 so that itslidably fits in bore 54. Further, the die 62 may be removed so that adie of different size corresponding to the size of punch 53 may beinserted therein, since again the only criterion is the size of the diebutton 61.

It will be appreciated, of course, that the fitting 30 and the bottom ofthe outer shell 32 may be interchanged with another fitting 30, having adifferent bore 31 so that various size pop rivets can be utilized.Insofar as the jaws 43 are concerned, of course, there is sufficientplay that minor variations in shaft size 13 are immaterial with thevarious sized pop rivets.

It will be appreciated that I have provided a useful combination toolwherein the action provided through the resistance arm RA of the leverof handle 3 in the rectilinear movement of drawbar 35 simultaneouslyextends punch 53 and actuates the mechanism of the pop rivet attachment10. This allows the operator to use the-punch and pop rivet assemblysimultaneously or alternately as preferred.

1 claim:

1. A metalworking hand tool, including, in combinations:

A. a pop rivet assembly for joining sheet metal pieces together;

B. a punch assembly including a punch and die for punching holes insheet metal for insertion of a pop rivet;

C. a first housing;

D. a drawbar, operatively connected to said pop rivet assembly and tosaid punch and mounted in axial alignment with said pop rivet assemblyand said punch in said first housing for rectilinear movement to actuatesaid pop rivet assembly to draw a pop rivet shaft into said housing andfor simultaneously moving said punch between retracted and extendedpositions;

1. said rectilinear movement of said drawbar which acts to extend saidpunch being the same rectilinear movement which draws a pop rivet shaftinto said housing;

E. means for moving said drawbar;

F. said pop rivet assembly comprising:

1. an inner shell attached to said drawbar so as to move with saiddrawbar:

2. a pair of jaws disposed within said inner shell for grasping theshaft of a pop rivet;

3. an exterior shell, forming part of said first housing and beingimmovable relative to said inner shell;

4. a fitting at the end of said exterior shell to engage the upperflange of the fastener of said pop rivet as the shaft is drawn throughsaid fastener and into said housing so as to flare the bottom of thefastener and form a lower flange.

2. a metal working tool, as defined in claim 1, in which said pop rivetassembly includes:

A. pressure means for applying increased pressure to said pair of jawsas the jaws move with said inner shell to move said shaft of said poprivet.

3. A metal working tool, as defined in claim 1 in which said drawbarcontains an internal bore at one end, for insertion of the end of theshaft of said pop rivet.

4. A metalworking tool, as defined in claim 2 in which drawbar containsan internal bore at one end, the further combination therewith of aspring contained in the bore of said drawbar and mounted so as to exertpressure on said pressure means.

5. A metal working tool, as defined in claim 2, in which said pressuremeans include a plunger having a central bore through which said shaftof said pop rivet projects.

6. A metalworking tool, as defined in claim 1, in which said inner shellcontains a tapered recess, open at its lower end, for provision of saidjaws.

7. A metalworking tool, as defined in claini 6, in which the lower endof said jaws are tapered so as to fit into the tapered recess of saidinner shell and project through the open end of said tapered recess.

8. A metal working tool, as defined in claim 4, in which said plungerhas a shaped head, and in which the upper end of each of said pair ofjaws is shaped so that the pair of jaws form a depression whichregisters with said shaped head.

9. A metal working tool, as defined in claim 1, in which said punchassembly includes:

A. a second metal housing adapted to register with the first housing andincluding:

1. a bore for slidably mounting said punch in operative relation withsaid drawbar;

2. a recess in alignment with said bore for mounting of said die inalignment with said punch;

3. mounting means for mounting said second metal housing to said firsthousing.

10. A metal working tool, as defined in claim 9 in which:

A. said housing contains a throat disposed between the bore for saidpunch and the recess for said die.

11. A metalworking tool, as defined in claim 9, in which said mountingmeans include depending ears, mounted over said first housing.

12. A metal working tool, as defined in claim 9, in which:

A. said bore for said punch contains the end of said drawbar.

13. A metal working tool, as defined in claim 9, in which said drawbarcontains a recess for engagement with the head of said punch.

14. A metalworking tool, as defined in claim 9, in which said die isremovably secured in said recess by means of a threaded cap.

15. A metalworking tool, as defined in claim 1, in which:

A. said means for moving said drawbar includes a handle forming a leverand having a resistance arm and an effort arm, said resistance arm beinginoperative connection with said drawbar to effect said rectilinearmovement of said drawbar.

16. A metalworking tool, as defined in claim 15, in which:

A. said operative connection of s said drawbar with the resistance armof said lever is by means of a first pin passing through the end of saidresistance arm and the middle portion of the body of said drawbar.

17. A metalworking tool, as defined in claim 15, the further combinationtherewith of a spring, mounted so as to exert pressure against saideffort arm of said lever.

18. A metalworking tool, as defined in claim 15, in which said handleand said first housing are joined together by means of a second pinwhich serves as a fulcrum for said lever.

19. A metalworking tool, as defined in claim 18, the further combinationtherewith of a second housing for said metal punch assembly:

A. said second housing containing a pair of depending ears which extendover either side ofsaid first housing:

1. said depending ears being pierced by the pin joining said firsthousing and said handle and serving as the fulcrum for said handle.

1. A metalworking hand tool, including, in combinations: A. a pop rivetassembly for joining sheet metal pieces together; B. a punch assemblyincluding a punch and die for punching holes in sheet metal forinsertion of a pop rivet; C. a first housing; D. a drawbar, operativelyconnected to said pop rivet assembly and to said punch and mounted inaxial alignment with said pop rivet assembly and said punch in saidfirst housing for rectilinear movement to actuate said pop rivetassembly to draw a pop rivet shaft into said housing and forsimultaneously moving said punch between retracted and extendedpositions;
 1. said rectilinear movement of said drawbar which acts toextend said punch being the same rectilinear movement which draws a poprivet shaft into said housing; E. means for moving said drawbar; F. saidpop rivet assembly comprising:
 1. an inner shell attached to saiddrawbar so as to move with said drawbar:
 2. a pair of jaws disposedwithin said inner shell for grasping the shaft of a pop rivet;
 3. anexterior shell, forming part of said first housing and being immovablerelative to said inner shell;
 4. a fitting at the end of said exteriorshell to engage the upper flange of the fastener of said pop rivet asthe shaft is drawn through said fastener and into said housing so as toflare the bottom of the fastener and form a lower flange.
 2. a pair ofjaws disposed within said inner shell for grasping the shaft of a poprivet;
 2. a metal working tool, as defined in claim 1, in which said poprivet assembly includes: A. pressure means for applying increasedpressure to said pair of jaws as the jaws move with said inner shell tomove said shaft of said pop rivet.
 2. a recess in alignment with saidbore for mounting of said die in alignment with said punch;
 3. mountingmeans for mounting said second metal housing to said first housing.
 3. Ametal working tool, as defined in claim 1 in which said drawbar containsan internal bore at one end, for insertion of the end of the shaft ofsaid pop rivet.
 3. an exterior shell, forming part of said first housingand being immovable relative to said inner shell;
 4. a fitting at theend of said exterior shell to engage the upper flange of the fastener ofsaid pop rivet as the shaft is drawn through said fastener and into saidhousing so as to flare the bottom of the fastener and form a lowerflange.
 4. A metalworking tool, as defined in claim 2 in which drawbarcontains an internal bore at one end, the further combination therewithof a spring contained in the bore of said drawbar and mounted so as toexert pressure on said pressure means.
 5. A metal working tool, asdefined in claim 2, in which said pressure means include a plungerhaving a central bore through which said shaft of said pop rivetprojects.
 6. A metalworking tool, as defined in claim l, in which saidinner shell contains a tapered recess, open at its lower end, forprovision of said jaws.
 7. A metalworking tool, as defined in claim 6,in which the lower end of said jaws are tapered so as to fit into thetapered recess of said inner shell and project through the open end ofsaid tapered recess.
 8. A metal working tool, as defined in claim 4, inwhich said plunger has a shaped head, and in which the upper end of eachof said pair of jaws is shaped so that the pair of jaws form adepression which registers with said shaped head.
 9. A metal workingtool, as defined in claim 1, in which said punch assembly includes: A. asecond metal housing adapted to register with the first housing andincluding:
 10. A metal working tool, as defined in claim 9 in which: A.said housing contains a throat disposed between the bore for said punchand the recess for said die.
 11. A metalworking tool, as defined inclaim 9, in which said mounting means include depending ears, mountedover said first housing.
 12. A metal working tool, as defined in claim9, in which: A. said bore for said punch contains the end of saiddrawbar.
 13. A metal working tool, as defined in claim 9, in which saiddrawbar contains a recess for engagement with the head of said punch.14. A metalworking tool, as defined in claim 9, in which said die isremovably secured in said recess by means of a threaded cap.
 15. Ametalworking tool, as defined in claim l, in which: A. said means formoving said drawbar includes a handle forming a lever and having aresistance arm and an effort arm, said resistance arm being inoperativeconnection with said drawbar to effect said rectilinear movement of saiDdrawbar.
 16. A metalworking tool, as defined in claim 15, in which: A.said operative connection of s said drawbar with the resistance arm ofsaid lever is by means of a first pin passing through the end of saidresistance arm and the middle portion of the body of said drawbar.
 17. Ametalworking tool, as defined in claim 15, the further combinationtherewith of a spring, mounted so as to exert pressure against saideffort arm of said lever.
 18. A metalworking tool, as defined in claim15, in which said handle and said first housing are joined together bymeans of a second pin which serves as a fulcrum for said lever.
 19. Ametalworking tool, as defined in claim 18, the further combinationtherewith of a second housing for said metal punch assembly: A. saidsecond housing containing a pair of depending ears which extend overeither side of said first housing: